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Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia

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dc.contributor.author Biskaborn B.
dc.contributor.author Nazarova L.
dc.contributor.author Pestryakova L.
dc.contributor.author Syrykh L.
dc.contributor.author Funck K.
dc.contributor.author Meyer H.
dc.contributor.author Chapligin B.
dc.contributor.author Vyse S.
dc.contributor.author Gorodnichev R.
dc.contributor.author Zakharov E.
dc.contributor.author Wang R.
dc.contributor.author Schwamborn G.
dc.contributor.author Bailey H.
dc.contributor.author Diekmann B.
dc.date.accessioned 2020-01-15T21:48:27Z
dc.date.available 2020-01-15T21:48:27Z
dc.date.issued 2019
dc.identifier.issn 1726-4170
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/156099
dc.description.abstract © 2019 BMJ Publishing Group. All rights reserved. Rapidly changing climate in the Northern Hemisphere and associated socio-economic impacts require reliable understanding of lake systems as important freshwater resources and sensitive sentinels of environmental change. To better understand time-series data in lake sediment cores, it is necessary to gain information on within-lake spatial variabilities of environmental indicator data. Therefore, we retrieved a set of 38 samples from the sediment surface along spatial habitat gradients in the boreal, deep, and yet pristine Lake Bolshoe Toko in southern Yakutia, Russia. Our methods comprise laboratory analyses of the sediments for multiple proxy parameters, including diatom and chironomid taxonomy, oxygen isotopes from diatom silica, grain-size distributions, elemental compositions (XRF), organic carbon content, and mineralogy (XRD). We analysed the lake water for cations, anions, and isotopes. Our results show that the diatom assemblages are strongly influenced by water depth and dominated by planktonic species, i.e. Pliocaenicus bolshetokoensis. Species richness and diversity are higher in the northern part of the lake basin, associated with the availability of benthic, i.e. periphytic, niches in shallower waters. δ18Odiatom values are higher in the deeper south-western part of the lake, probably related to water temperature differences. The highest amount of the chironomid taxa underrepresented in the training set used for palaeoclimate inference was found close to the Utuk River and at southern littoral and profundal sites. Abiotic sediment components are not symmetrically distributed in the lake basin, but vary along restricted areas of differential environmental forcing. Grain size and organic matter are mainly controlled by both river input and water depth. Mineral (XRD) data distributions are influenced by the methamorphic lithology of the Stanovoy mountain range, while elements (XRF) are intermingled due to catchment and diagenetic differences. We conclude that the lake represents a valuable archive for multiproxy environmental reconstruction based on diatoms (including oxygen isotopes), chironomids, and sediment-geochemical parameters. Our analyses suggest multiple coring locations preferably at intermediate depth in the northern basin and the deep part in the central basin, to account for representative bioindicator distributions and higher temporal resolution, respectively.
dc.relation.ispartofseries Biogeosciences
dc.title Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia
dc.type Article
dc.relation.ispartofseries-issue 20
dc.relation.ispartofseries-volume 16
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 4023
dc.source.id SCOPUS17264170-2019-16-20-SID85073732246


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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